CN104481898B - Use the external rotor axial-flow fan of electromagnetic bearing - Google Patents
Use the external rotor axial-flow fan of electromagnetic bearing Download PDFInfo
- Publication number
- CN104481898B CN104481898B CN201410729449.1A CN201410729449A CN104481898B CN 104481898 B CN104481898 B CN 104481898B CN 201410729449 A CN201410729449 A CN 201410729449A CN 104481898 B CN104481898 B CN 104481898B
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- China
- Prior art keywords
- axial
- hole
- radial magnetic
- magnetic bearing
- external rotor
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- Expired - Fee Related
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- 238000006073 displacement reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/058—Bearings magnetic; electromagnetic
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a kind of external rotor axial-flow fan using electromagnetic bearing.It includes that cylindrical housing, bracing frame, axial flow fan vane wheel and external rotor electric machine, axial flow fan vane wheel and external rotor electric machine are placed in the cavity of cylindrical housing, and bracing frame is positioned at cylindrical housing air outlet and bracing frame is fixed with cylindrical housing and is connected；External rotor electric machine includes that motor housing, the first radial magnetic bearing, the second radial magnetic bearing, permanent magnet, stator core, axial electromagnetic bearings and stator axis, the first radial magnetic bearing, the second radial magnetic bearing, permanent magnet, stator core, axial electromagnetic bearings and stator axis are placed in motor housing.The present invention can change the rigidity of electromagnetic bearing by the electromagnetic force between stator and the rotor of each electromagnetic bearing of control, the most actively change axial flow fan vane wheel natural frequency, it is prevented effectively from the generation of system resonance, make the blower fan can even running under whole working speeds, and bearing life is greatly improved, reduce mechanical loss.
Description
Technical field
The invention belongs to blower fan field, relate to a kind of external rotor axial-flow fan.
Background technology
The external rotor axial-flow fan application in blower fan field is more and more extensive, and the impeller of its blower fan is directly connected to rotor, rotates, impeller and motor are combined together outside stator, this structure have compact to design, be prone to the advantages such as space layout.But being as the increase of industrial requirement, make rotation speed of fan more and more higher, the requirement to motor is more and more higher.Along with increasing of motor speed, the life-span of conventional contact bearing is shorter and shorter, is lost the most increasing, it is difficult to meet design requirement.For the axial flow blower of speed governing, owing to its impeller natural frequency can not change, when the natural frequency of impeller is consistent with the blower fan system frequency under some rotating speed, system can resonate, and makes axial flow blower produce and destroys.
Summary of the invention
The technical problem to be solved is to provide a kind of external rotor axial-flow fan using electromagnetic bearing, to be prevented effectively from the generation of system resonance, makes the axial flow blower can be with even running under whole working speeds.
The technical solution adopted for the present invention to solve the technical problems is: the present invention uses the external rotor axial-flow fan of electromagnetic bearing to include cylindrical housing, bracing frame, axial flow fan vane wheel and external rotor electric machine, the front end of described cylindrical housing has air inlet, the rear end of cylindrical housing has air outlet, axial flow fan vane wheel and external rotor electric machine are placed in the cavity of cylindrical housing, and support frame as described above is positioned at the air outlet of described cylindrical housing and bracing frame is fixed with cylindrical housing and is connected；Wherein, described external rotor electric machine includes that motor housing, the first radial magnetic bearing, the second radial magnetic bearing, permanent magnet, stator core, axial electromagnetic bearings and stator axis, described first radial magnetic bearing, the second radial magnetic bearing, permanent magnet, stator core, axial electromagnetic bearings and stator axis are placed in motor housing；The center of support frame as described above has central through hole；On the outer wall of the motor housing that axial flow fan vane wheel is fixedly mounted on external rotor electric machine；Stator axis is affixed with bracing frame to be connected；Stator core is connected with stator axis hot jacket, the stator of the stator of the first radial magnetic bearing, the stator of the second radial magnetic bearing and axial electromagnetic bearings is fixedly mounted in stator axis, described first radial magnetic bearing is between stator core and the air inlet of cylindrical housing, second radial magnetic bearing is between stator core and the air outlet of cylindrical housing, and axial electromagnetic bearings is between stator core and the second radial magnetic bearing；The rotor of the rotor of the first radial magnetic bearing, the rotor of the second radial magnetic bearing and axial electromagnetic bearings is all fixing with the inwall of motor housing to be connected；Described permanent magnet is uniformly arranged on the inwall of motor housing along the circumference of motor housing, and each permanent magnet is the most right with stator core；The wire of described first radial magnetic bearing, stator core, the second radial magnetic bearing and axial electromagnetic bearings draws external rotor axial-flow fan via the central through hole of bracing frame.
Further, the stator axis of external rotor electric machine of the present invention is provided with axial central through hole, being additionally provided with the first cable-through hole, the second cable-through hole and the 3rd cable-through hole radially in stator axis, the described central through hole of stator axis connects with the first cable-through hole, the second cable-through hole and the 3rd cable-through hole respectively；The wire of described first radial magnetic bearing draws external rotor axial-flow fan via the central through hole of the first cable-through hole, the described central through hole of stator axis, bracing frame, the wire of stator core and the second radial magnetic bearing draws external rotor axial-flow fan via the central through hole of the second cable-through hole, the described central through hole of stator axis, bracing frame, and the wire of axial electromagnetic bearings draws external rotor axial-flow fan via the central through hole of the 3rd cable-through hole, the described central through hole of stator axis, bracing frame.
Further, the central through hole of bracing frame of the present invention is opened in the center of a support plate.
Compared with prior art, the invention has the beneficial effects as follows:
The axial flow blower of the present invention can change the rigidity of radial magnetic bearing by the electromagnetic force between stator and the rotor of control radial magnetic bearing, the rigidity of axial electromagnetic bearings is changed by the electromagnetic force between stator and the rotor of control axial electromagnetic bearings, the most actively change the natural frequency of axial flow fan vane wheel, it is prevented effectively from the generation of system resonance, make the blower fan can be with even running under whole working speeds, resonance is there is and then produces the harm destroyed in the axial flow blower avoiding tradition speed governing when some rotating speed, bearing life is also greatly improved, reduces mechanical loss.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2
It it is the structural representation of the external rotor electric machine of the present invention.
Fig. 3
It it is the right view of bracing frame in Fig. 2.
Detailed description of the invention
The present invention is further illustrated below in conjunction with the accompanying drawings.
As it is shown in figure 1, external rotor axial-flow fan of the present invention includes cylindrical housing 1, bracing frame 2, axial flow fan vane wheel 3 and external rotor electric machine 4.As it is shown on figure 3, as one embodiment of the present invention, bracing frame 2 can be made up of a support plate 12 and multiple gusset 11, and multiple gussets 11 are welded on a support plate 12 equably along the circumference of a support plate 12.The front end of cylindrical housing 1 has air inlet 13, and the rear end of cylindrical housing 1 has air outlet 14.Axial flow fan vane wheel 3 and external rotor electric machine 4 are placed in the cavity of cylindrical housing 1.Installing bracing frame 2 at the air outlet 14 of cylindrical housing 1, each gusset 11 of bracing frame 2 is fixing with cylindrical housing 1 to be connected.Additionally, bracing frame 2 also has central through hole 121.Preferably, the central through hole 121 of bracing frame 2 is opened in the center of a support plate 12.
As shown in Figure 2, external rotor electric machine 4 includes that motor housing the 5, first radial magnetic bearing the 91, second radial magnetic bearing 92, permanent magnet 6, stator core 7, axial electromagnetic bearings 8 and stator axis 10, first radial magnetic bearing the 91, second radial magnetic bearing 92, permanent magnet 6, stator core 7, axial electromagnetic bearings 8 and stator axis 10 are placed in motor housing 5.Axial flow fan vane wheel 3 is fixedly mounted on the outer wall of motor housing 5 of external rotor electric machine 4.By the bolt of bolt hole offered on a support plate 12 and bracing frame 2, stator axis 10 props up that support plate 12 is affixed to be connected.
As in figure 2 it is shown, stator core 7 is connected with stator axis 10 hot jacket, the stator of the stator of the first radial magnetic bearing 91, the stator of the second radial magnetic bearing 92 and axial electromagnetic bearings 8 is all fixedly mounted in stator axis 10.Specifically, first radial magnetic bearing 91 and the second radial magnetic bearing 92 lay respectively at the both sides of stator core 7, wherein, first radial magnetic bearing 91 is between the air inlet 13 and stator core 7 of cylindrical housing 1, so that the first radial magnetic bearing 91 is near the air inlet 13 of cylindrical housing 1；Second radial magnetic bearing 92 is between the air outlet 14 of stator core 7 and cylindrical housing 1, so that the second radial magnetic bearing 92 is near the air outlet 14 of cylindrical housing 1；Axial electromagnetic bearings 8 is between stator core 7 and the second radial magnetic bearing 92.The rotor of the rotor of the first radial magnetic bearing 91, the rotor of the second radial magnetic bearing 92 and axial electromagnetic bearings 8 is all fixing with the inwall of motor housing 5 to be connected.Multiple permanent magnets 6 are uniformly fixedly mounted on the inwall of motor housing 5 along the circumference of motor housing 5, and each permanent magnet 6 is the most right with stator core 7.
As the preferred embodiment of the present invention, the stator axis 10 of external rotor electric machine 4 is provided with axial central through hole 101, and, being additionally provided with the first cable-through hole the 102, second cable-through hole 103 and the 3rd cable-through hole 104 radially in stator axis 10, axial central through hole 101 connects with first cable-through hole the 102, second cable-through hole 103 radially and the 3rd cable-through hole 104 respectively.Wherein, the wire of the first radial magnetic bearing 91 draws external rotor axial-flow fan of the present invention via the first cable-through hole 102, the central through hole 101 of stator axis 10, the central through hole 121 of a support plate 12 successively, the wire of stator core 7 and the second radial magnetic bearing 92 draws external rotor axial-flow fan via the second cable-through hole 103, the central through hole 101 of stator axis 10, the central through hole 121 of a support plate 12 successively, and the wire of axial electromagnetic bearings 8 draws external rotor axial-flow fan via the 3rd cable-through hole 104, the central through hole 101 of stator axis 10, the central through hole 121 of a support plate 12 successively.
In the present invention, first radial magnetic bearing the 91, second radial magnetic bearing 92 and the respective stator of axial electromagnetic bearings 8 and rotor are all contactless.The respective stator of these electromagnetic bearings is provided with multiple control coil, size of current in the control coil of each electromagnetic bearing is independent control, by actively controlling the size of electric current in each control coil, change the electromagnetic force between the stator of electromagnetic bearing and rotor, prevent stator and the rotor contact of electromagnetic bearing；Can control axial displacement and the axial rigidity of axial electromagnetic bearings 8 by actively controlling the control coil of axial electromagnetic bearings 8 by actively controlling to change the radial rigidity of radial magnetic bearing simultaneously.The impeller of conventional axial flow blower fan is non-adjustable due to spring bearing, and its natural frequency is fixed, when axial flow blower speed governing operation, under some rotating speed, the frequency of ventilating system reaches consistent with certain rank natural frequency of impeller, so that the vibration of axial flow blower strengthens, even destroys.And the radial rigidity of two radial magnetic bearings of external rotor axial-flow fan scalable of the present invention and the axial displacement of axial electromagnetic bearings 8 and axial rigidity, the natural frequency of axial flow fan vane wheel 3 is as well as change, therefore, when the frequency of ventilating system and the natural frequency of axial flow fan vane wheel 3 close to time, can be by changing the rigidity of corresponding electromagnetic bearing, make the natural frequency frequency away from ventilating system of axial flow fan vane wheel 3, make axial flow blower in whole speed adjustable range can even running, improve the reliability of system.External rotor axial-flow fan of the present invention can also be greatly improved bearing life, decreases mechanical loss.
Claims (3)
1. the external rotor axial-flow fan using electromagnetic bearing, including cylindrical housing, bracing frame, axial flow fan vane wheel and external rotor electric machine, the front end of described cylindrical housing has air inlet, the rear end of cylindrical housing has air outlet, axial flow fan vane wheel and external rotor electric machine are placed in the cavity of cylindrical housing, and support frame as described above is positioned at the air outlet of described cylindrical housing and bracing frame is fixed with cylindrical housing and is connected；It is characterized in that: described external rotor electric machine includes that motor housing, the first radial magnetic bearing, the second radial magnetic bearing, permanent magnet, stator core, axial electromagnetic bearings and stator axis, described first radial magnetic bearing, the second radial magnetic bearing, permanent magnet, stator core, axial electromagnetic bearings and stator axis are placed in motor housing；The center of support frame as described above has central through hole；On the outer wall of the motor housing that axial flow fan vane wheel is fixedly mounted on external rotor electric machine；Stator axis is affixed with bracing frame to be connected；Stator core is connected with stator axis hot jacket, the stator of the stator of the first radial magnetic bearing, the stator of the second radial magnetic bearing and axial electromagnetic bearings is fixedly mounted in stator axis, described first radial magnetic bearing is between stator core and the air inlet of cylindrical housing, second radial magnetic bearing is between stator core and the air outlet of cylindrical housing, and axial electromagnetic bearings is between stator core and the second radial magnetic bearing；The rotor of the rotor of the first radial magnetic bearing, the rotor of the second radial magnetic bearing and axial electromagnetic bearings is all fixing with the inwall of motor housing to be connected；Described permanent magnet is uniformly arranged on the inwall of motor housing along the circumference of motor housing, and each permanent magnet is the most right with stator core；The wire of described first radial magnetic bearing, stator core, the second radial magnetic bearing and axial electromagnetic bearings draws external rotor axial-flow fan via the central through hole of bracing frame.
External rotor axial-flow fan the most according to claim 1, it is characterized in that: the stator axis of described external rotor electric machine is provided with axial central through hole, being additionally provided with the first cable-through hole, the second cable-through hole and the 3rd cable-through hole radially in stator axis, the described central through hole of stator axis connects with the first cable-through hole, the second cable-through hole and the 3rd cable-through hole respectively；The wire of described first radial magnetic bearing draws external rotor axial-flow fan via the central through hole of the first cable-through hole, the described central through hole of stator axis, bracing frame, the wire of stator core and the second radial magnetic bearing draws external rotor axial-flow fan via the central through hole of the second cable-through hole, the described central through hole of stator axis, bracing frame, and the wire of axial electromagnetic bearings draws external rotor axial-flow fan via the central through hole of the 3rd cable-through hole, the described central through hole of stator axis, bracing frame.
External rotor axial-flow fan the most according to claim 1 and 2, is characterized in that: the central through hole of support frame as described above is opened in the center of a support plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729449.1A CN104481898B (en) | 2014-12-05 | 2014-12-05 | Use the external rotor axial-flow fan of electromagnetic bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410729449.1A CN104481898B (en) | 2014-12-05 | 2014-12-05 | Use the external rotor axial-flow fan of electromagnetic bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104481898A CN104481898A (en) | 2015-04-01 |
| CN104481898B true CN104481898B (en) | 2017-01-04 |
Family
ID=52756480
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410729449.1A Expired - Fee Related CN104481898B (en) | 2014-12-05 | 2014-12-05 | Use the external rotor axial-flow fan of electromagnetic bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104481898B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104901478A (en) * | 2015-06-12 | 2015-09-09 | 北京百正创源科技有限公司 | Outer rotor permanent magnet motor for cooling fan of direct-cooled thermal power plant |
| CN104863877A (en) * | 2015-06-12 | 2015-08-26 | 北京百正创源科技有限公司 | Outer rotor permanent magnet fan system for direct-cooling thermal power plant |
| CN112483447A (en) * | 2021-01-13 | 2021-03-12 | 江苏苏仪集团有限公司 | Permanent magnet axial flow cooling fan for electromechanical integration of air cooling island of power plant |
| CN113339286A (en) * | 2021-06-28 | 2021-09-03 | 鑫磊压缩机股份有限公司 | Axial flow fan adopting magnetic suspension outer rotor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB562841A (en) * | 1943-05-10 | 1944-07-18 | British Thomson Houston Co Ltd | Improvements in and relating to couplings for axial flow fans |
| CN2588082Y (en) * | 2002-09-10 | 2003-11-26 | 王德惠 | Safety-increased axial flow blowing fan for explosion-resisting frequency-changing speed-adjusting motor |
| CN201013632Y (en) * | 2007-03-06 | 2008-01-30 | 杭州微光电子设备厂 | Outer rotor brushless direct current axial-flow draught fan |
| CN103758766A (en) * | 2012-06-22 | 2014-04-30 | Skf磁性机械技术公司 | Compact electric centrifugal compressor |
| CN204312374U (en) * | 2014-12-05 | 2015-05-06 | 浙江理工大学 | A kind of external rotor axial-flow fan adopting electromagnetic bearing |
-
2014
- 2014-12-05 CN CN201410729449.1A patent/CN104481898B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB562841A (en) * | 1943-05-10 | 1944-07-18 | British Thomson Houston Co Ltd | Improvements in and relating to couplings for axial flow fans |
| CN2588082Y (en) * | 2002-09-10 | 2003-11-26 | 王德惠 | Safety-increased axial flow blowing fan for explosion-resisting frequency-changing speed-adjusting motor |
| CN201013632Y (en) * | 2007-03-06 | 2008-01-30 | 杭州微光电子设备厂 | Outer rotor brushless direct current axial-flow draught fan |
| CN103758766A (en) * | 2012-06-22 | 2014-04-30 | Skf磁性机械技术公司 | Compact electric centrifugal compressor |
| CN204312374U (en) * | 2014-12-05 | 2015-05-06 | 浙江理工大学 | A kind of external rotor axial-flow fan adopting electromagnetic bearing |
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| Publication number | Publication date |
|---|---|
| CN104481898A (en) | 2015-04-01 |
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Granted publication date: 20170104 Termination date: 20171205 |